> sentiment

...

> theory

these two words aren't interchangeable

> Jean-Jacques Rousseau, Adam Smith, Wilhelm von Ketteler, Louis Blanc

...

> generic cog-in-the-machine critique that is explored by many other people

literally only one of the names you mentioned were writing post industrial revolution - the rest had literally no notion of "cog in the machine"

you're trying so hard to disprove basically an established fact: Marx's critique of exploitation of labor post industrial revolution is certainly original and significant in his own work and those that followed.